Was a am-fm radio an option for the 1968 Firebird? I got my phs packet/window sticker and it has radio push button for $61.09. I'm guessing it's for an am radio as listed in packet but the car has a am-fm in it. Dealer installed? What did that option cost then?

Cannot speak directly to 1968. In 1967 it was a very expensive option. On our bird only the a/c and 4 speed cost more than the am/fm radio!
Cal

The '68 Sales Manual is available on another part of this site. It includes these option prices:
https://firstgenfirebird.org/1968-info/1968-technical-information/sales_manual/sales/t_index/t-1/
and
https://firstgenfirebird.org/1968-info/1968-technical-information/sales_manual/sales/t_index/t-2/